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For which of the following reactions, the degree of dissociation (α) and equilibrium constant (KP) are related as
KP=4α2P/(1–α2)?

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H2(g) + I2(g) ⇌ 2HI(g)

PCl3(g) + Cl2(g) ⇌2PCl5(g)

N2O4(g)⇌2NO2(g)

N2(g) + 3H2(g) ⇌2NH3(g)

answer is A.

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Detailed Solution

in the above reaction, the concentration of N2O4=1–α,

The concentration of NO2=α

Now, we know that mole fraction = number of moles/total miles

So, Kp= [(2α/1+α)p]2/[(1–α/1+α)p]

Kp=[(4α2)/(1+α)2P2]/[(1–α)/(1+α)P]

Kp=4α2p/1–α2

Therefore, the correct answer is option (A) N2O4(g)⇌2NO2(g).

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